i don't know that back tax -- back taxes included in this? >> they'll have to pay back taxes. >> bill: for how many years? >> that's one of the details that has to be worked out. not only do they have to pay back taxes they have to prove they've been employed and with undocumented immigrants where there's little documentation available, it is unclear if that's a burden they'll be able to meet. >> bill: yeah. donna, you raise a very good point. i think that could really be a problem. certainly, a lot of these people particularly those at the lower end who are doing landscaping, washing dishes in restaurants, busing tables or whatever or child care, they don't have that kind of job documentation. plus they have been paying taxes. they've been paying sales taxes. >> that's right. presumably those jobs, if their income doesn't meet the threshold of the bottom income bracket, they'll be exempt. >> bill: talk about unfair exception here. so how about if you go back and make some american citizens pay the back taxes that they didn't pay, particularl